Improvement in sheet-metal-folding machines



G. H. GOLDSMITH. SHEET METAL FOLDING MACHINE.

No. 78,734. Patented June 9, 1868.

ings, ',ivorming part of UNITED, STATES PATENT OFFICE.

GEORGE H. GOLDSMITH, OF WAVERLY, ILLINOIS.

IMPROVEMENT IN SHEETMFETALF0LD|NG MACHINES.

'Spccitication forming part oi Letters Patent NIL-78,734.1, dated June 9, 1868.

. ABe it known that LGEORGE Ll?. (l-'oLDsM-r'ru,"

of vW'Vaverly, in .the county -c-t"A Morgan' and State of Illinois, haveV invented new and usei'ul Improvements in Machines for Double-Lap- 'ping' Sheet Metal; and I do hereby declare that the following is a full, clear, and exact descriptionthereoi`,',wh'ich will enable those view of the barrelof the main cogwheel.

Similar letters of reference indicate corre- -spondingl parts.

I Thisinvention rei'crs to a machine chieiiy .n sed by vtinsmiths.

It consists ot' an automatic brake-bar for 'bending the tin with a double lap at its edge, together with the other devices perfecting the voperation of the whole, as will now he more fully set fort-h.

In'the drawings, A is the rolle-r, having one or more iiutiugs, a. This roller'i-,is'v provided with-bearings in the general frameB ot' the machine, as shown. A cap, C, bfolted to the frame, as shown, iucloses a pinion,`D, and furnishes an outer bearing tbr-"the shaft b of the same. To this shaft a crank, d, is aftixed.

The' pinion D engages with a cog-wheel, E, mounted on the reduced end ot' the roller Ay furthe purpose of rotating the said roller iu the operation of bending the edge of the sheet.

4'Ibe brake-bar F is provided with reduced circular ends e e in the usual manner for the purposes of permitting the said brake-bar to `vibrate. These circular-ends aro notched to '-allowthe lateral withdrawal of the bended sheet, as 'heretofore done; but in the machines 'for this purpose, as heretofore made, the brake` b ar was. actuated by a separata handle, so that the formation of adouble lap upon a sheet required two or more separate movements.

1n my machine the double lap is formed by simply turning the crank d till the brake-bar is raised twice, and adjusting the sheet with onehaud for both movements of the said bar.

The mechanism accomplishing Athis result will now be described. y

Attached to .and forming part of the cogwheel E is a hollow barrel, Gr, the interior of which is better shown at Fig. 6. 4Near the i'n terior peripher7 ot this barrel the cam-blocks h are affixed inv any suitable manner, .as with screws.

'1,0 the end eof the brake-bar is atixed'an arm, i, `,having a stud-pin, Je, projecting therefrom, asshown, so that whew-the barrel (lr re- 'volves the cam-blolclis h will 'rinpnge against the stud-pin hand as the said barrel revolves the" arm t' and consequently the brake' bar F are brought to al vertical position, as shown by the red sectionv F' 'at Fig. 3. The barrel G and ends e c ot' the brake-bar bein g eccentric and the axis of vibration of the brake-bar being somewhatlower than that of the roller A. and its barrel (lr, the cam-blocks h risc -above the stud-pin L and disengage from it,as shownby the red outline at Fig. l, whereby the-brakebar falls to its first' position,A as shown in Figs. 2 and 3. y The single or .first lap being' thus formed, the crank is turned till the sec- `ond flut'ing ot' the roller A comes to the edge.

ofthe blade-bar I, or alittle below, when the sheet is caught in the iluting andthe crank d turned again, when-'the second caniblock again raises the brake-bar,'thereby forming the second bend and completing the operation, which leaves the sheet bent, as shown at. Fig. 5.

To permit the perfectvbending ofV the sheet the blade-bar is formed with a channel, l, running` along its ,lower edge, whereby space is provided 4for t'he accommodation ot' the increased thickness due to the second bend, which conduces greatly` to the successful operation of the machine.

By my improved machine -oue person can accomplish twice the work possible with the machines as heretofore made. p

Various moditications of the cum-blocks are possible which would probably accomplish the raising of the brake-bar in a similar manner, and I have contemplated several methods for the same, but have set fo'rth in the foregoing what I consider to be the best arrangement of 'the parts for the general purpose of raising cause it', to be appreciated work'ers who use it.

I claim as new and ters Patentl, The cog-wheel E, bearing cam-blocks h or other equivalent: device, substantially as shown and described, for the purpose of operating;r the brake-bar F, all as set forth.

2. The arm i and stud thereof, substantially as shown and described, in combination with the brake-bar Fand cogby all" sheet-metal desire to secure by Leiswheel E, all as and for the purpose set forth,

3. The ijnted roller A, substantially as shown and descriheihin combination with the k, or the equivalentblade-bar I, hrenkbar 11, and cog-wheel E, all

,as and for the purposes set forth.

4. Thechannel l of theblade-bar I, suhstantiallly as shown and described, and for the 'purpose speciied. v

The pinion D and cog-wheel E, substantially as shown and described, in 'combination with the roller A, brake-bar F, and blade-bar I, all as and for the purpose sei; forth.

GEORGE H. GrvOLDSMITH.A

Witnesses:

MOSES, F. FREEMAN, ISREAL SHAWGO.- 

